[iOS] Define bundle_data target for //google_apis:google_apis_unittests.

This ensure that the files required by google_apis_unittests application
will be copied into the application bundle on iOS.

BUG=297668

Review URL: https://codereview.chromium.org/1811533005

Cr-Commit-Position: refs/heads/master@{#381935}

google_apis/BUILD.gn

@@ -224,6 +224,17 @@ source_set("test_support") {
   }
 }
 
+bundle_data("google_apis_unittests_bundle_data") {
+  testonly = true
+  sources = [
+    "test",
+  ]
+  outputs = [
+    "{{bundle_resources_dir}}/" +
+        "{{source_root_relative_dir}}/{{source_file_part}}",
+  ]
+}
+
 test("google_apis_unittests") {
   sources = [
     "gaia/gaia_auth_fetcher_unittest.cc",
@@ -247,6 +258,7 @@ test("google_apis_unittests") {
 
   deps = [
     ":google_apis",
+    ":google_apis_unittests_bundle_data",
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",